The book details the very strict diet Kennedy adhered to, which totaled around 600 calories a day, as Daily Mail estimated. According to Livestrong, it's suggested that women consume anywhere from 1,600 to 2,200 calories a day depending on their lifestyle.

Scroll through to see what Jackie's meals consisted of:

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Jackie Kennedy Onassis' Diet

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Jackie Kennedy Onassis' Diet

Morning: One hard boiled egg and tea

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Lunch: Cottage cheese and fruit

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Dinner: One poached chicken breast and a salad

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Snack: Plain yogurt

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Cheat meal: Ice cream

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According to the memoir, she was obsessed with keeping her weight at 120 pounds. However, she did cheat. McKeon recalls in the book that she did catch Jackie eating ice cream out of the tub in the kitchen late one evening.